atomic weight

noun

Definition of atomic weight

  1. :  the mass of one atom of an element; specifically :  the average mass of an atom of an element as it occurs in nature that is expressed in atomic mass units — see element table

1819

First Known Use of atomic weight

1819


Medical Dictionary

atomic weight

noun

Medical Definition of atomic weight

  1. :  the mass of one atom of an element; specifically :  the average mass of an atom of an element as it occurs in nature that is expressed in atomic mass units—see element table


Learn More about atomic weight


Seen and Heard

What made you want to look up atomic weight? Please tell us where you read or heard it (including the quote, if possible).

WORD OF THE DAY

a leading champion of a cause

Get Word of the Day daily email!

WORD GAMES

Take a 3-minute break and test your skills!

  • fox-in-front-of-cabin-in-winter
  • The month of December comes from a Latin word that referred to which month of the year?
Name That Thing

Test your visual vocabulary with our 10-question challenge!

TAKE THE QUIZ
SCRABBLE® Sprint

Test Your Knowledge - and learn some interesting things along the way.

TAKE THE QUIZ